Thanks for sharing the required details. We are able to reproduce your reported issue at our end. We have logged this issue in our Issue Tracking System (with ID: VIEWERNET-1558) for further investigation. We’ll keep you informed in case of any updates.

Could you please kindly give me a rough estimate by when a hotfix will be available.
As I need to get the viewer running properly as soon as possible I would like to ask if there is an option to subscribe to a premium support plan to accelerate a solution for the issue.

I am afraid that we can not provide any ETA at the moment. However, you can prioritize the issue in our the issue tracking system by availing paid support. For more details on paid support, please visit here.